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Multiplication of Integers

A certain fre...

Question

A certain freezing process requires that room temperature be lowered from $40 ° C$ at the rate of $5 ° C$ every hour. What will be the room temperature $10$ hours after the process begins?

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Solution

From the given data we get to know that:
$I n i t i a l t e m p e r a t u r e = 40 ° C$
$C h a n g e i n t e m p e r a t u r e p e r h o u r = - 5 ° C$
$C h a n g e i n t e m p e r a t u r e a f t e r 10 h o u r s = (- 5) \times 10 = - 50 ° C$
$F i n a l t e m p e r a t u r e = 40 º C + (- 50 º C) = - 10 ° C$
Hence, $t h e f i n a l r o o m t e m p e r a t u r e a f t e r 10 h o u r s o f f r e e z i n g p r o c e s s = - 10^{o} C$ .

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